EP4018534A1 - Statorkühlung - Google Patents
StatorkühlungInfo
- Publication number
- EP4018534A1 EP4018534A1 EP20753282.1A EP20753282A EP4018534A1 EP 4018534 A1 EP4018534 A1 EP 4018534A1 EP 20753282 A EP20753282 A EP 20753282A EP 4018534 A1 EP4018534 A1 EP 4018534A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- electrical machine
- groove
- coolant
- laminated core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Definitions
- the invention relates to the cooling of a stator for an electrical machine and a corresponding method for operating an electrical machine.
- waveguide cooling is also known, for example, from German patent application DE 10 2017 119 033 A1.
- waveguide cooling With pure waveguide cooling, the heat from the laminated core is also dissipated via the waveguide, which means that the corresponding amount of heat must first pass through the insulation paper around the conductor and the conductor itself before they reach a coolant inside the waveguide.
- the stator in the laminated core and other components requires a clearance adjustment, which also leads to corresponding air gaps in the slots of the stator. Since air has a thermally insulating effect, this contributes to the aggravation of the problem set out above.
- thermal loads which can occur during the operation of an electrical machine, must be taken into account in the design of the electrical machine and therefore make appropriate overdrafts necessary.
- the lifespan of materials could be significantly increased by reducing temperature fluctuations, for example, and it would also be possible to use cheaper materials.
- the object of the invention is therefore to improve the cooling of a stator of an electrical Ma machine.
- the stator according to the invention for an electrical machine comprises a laminated core and turns of an electrical conductor guided at least in sections in slots of the stator.
- a spacer is provided which ensures a defined distance between the electrical conductor and the laminated core in a groove.
- a corresponding spacer is preferably provided for each groove.
- the spacer ensures the defined distance between the electrical conductor and the laminated core, the spacer transfers forces between the electrical conductor and the laminated core. As a result, the spacer also has the function of holding and transmitting a drive torque of the electrical machine.
- the spacer is a groove insert.
- This is preferably made of electrically insulating material and is preferably designed like a cage.
- the webs of the slot insert ensure a distance between the electrical conductor and the laminated core in the groove, and the spaces between the webs provide space for the flow of a coolant.
- the design of the slot insert can, if necessary, be adapted to various types of winding, for example to I-pin, hairpin, flat wire wave windings, or to any type of round or shaped wire winding.
- the groove insert is designed as a closed surface towards a groove opening which in the electrical machine faces an air gap to a rotor of the electrical machine. If the groove insert is glued into the groove, for example, the adhesive can also serve as a seal. Leakage between the metal sheets of the stator, for example, is small due to the hydraulic resistance and can be further reduced by appropriate design measures.
- a basic fastening of a groove insert in a respective groove can be done for example via one or more locking lugs.
- the spacer is provided by two fixing disks, preferably made of electrically insulating material, provided on axially opposite ends of the stator; “Axial” here refers to an axis of rotation around which a rotor of the electrical machine rotates when the electrical machine is in operation.
- the fixing washers can also take on the role of a stator carrier.
- At least one cap is provided which is sealed off from the laminated core of the stator and defines an area for receiving a coolant in the vicinity of winding heads of the stator. The end windings are then completely surrounded by coolant, and coolant can get into the slots of the stator from the defined area.
- an area for receiving a coolant can be defined at both ends of the stator, in each case by a corresponding cap sealed off from the laminated core.
- each fixing washer preferably has a closed contour on the inner circumference of the stator, which results in an improved seal with the caps.
- a coolant in a slot, preferably in all slots, between the electrical conductor and the laminated core.
- This is preferably an electrically non-conductive fluid, for example transformer oil.
- the electrical machine according to the invention has a stator as described above ben.
- a separator for coolant is provided which is designed to return coolant that has escaped from the stator into a cooling circuit of the stator.
- the stator is mechanically connected to a housing of the electrical machine via an electrically insulating torque support.
- basic insulation of the stator is achieved without the need for insulation material in the grooves, as a result of which the heat dissipation through the coolant is again significantly improved.
- This possibility of achieving basic insulation is described in more detail in German patent application DE 10 2019 118 122. It is then sufficient to limit oneself to functional insulation of the electrical conductor in the grooves.
- the method according to the invention for operating an electrical machine described above is characterized in that a coolant flows through an intermediate space between electrical conductor and laminated core in a groove of the stator of the electrical machine. The gap results from the defined distance between the electrical conductor and the laminated core, which is ensured by the spacer.
- Figure 1 shows a cross section through a slot of a stator according to the invention.
- Figure 2 shows an embodiment of a groove insert.
- FIG. 3 shows a perspective view of a groove insert inserted into a groove.
- FIG. 4 shows a plan view of a groove insert inserted into a groove.
- FIG. 5 shows a perspective view of a stator according to the invention.
- FIG. 6 shows a section through part of a stator according to the invention.
- FIG. 7 shows a further embodiment of a stator according to the invention.
- FIG. 8 shows a section of a fixing disk.
- FIG. 9 shows a plan view of a groove.
- Figure 10 shows an embodiment of an electrical Ma machine according to the invention.
- FIG. 11 shows a further embodiment of an electrical machine according to the invention.
- Fig. 1 shows a cross section through a groove 12 in a partially shown Blechpa ket 11 of a stator according to the invention.
- the groove 12 there are electrical conductors 2, which are surrounded with an insulating coating 21 for the purpose of functional insulation.
- an insulating coating 21 for the purpose of functional insulation.
- the defined distance 22 ensures that the coolant 100 is distributed around all electrical conductors 2 and can also come into contact with the delimitations, i.e. the wall, of the groove 12 over the full area, in order to ensure an optimal heat exchange between the conductors 2 and to achieve the coolant 100 and between the laminated core 11 and the coolant 100.
- the slot insert 3 is cage-like and comprises a large number of bars 31.
- the bars 31 ensure the defined distance 22 in a groove 12 between electrical conductors 2 and between electrical conductors 2 and delimitations of the groove 12.
- the spaces between the bars 31 offer space for the flow of a coolant 100.
- the groove insert 3 On one side of the groove insert 3, the latter has a closed surface 32. In an electrical machine, this side is oriented towards an air gap towards the rotor and thus seals the groove 12 against the air gap in order to prevent coolant 100 from leaking out.
- FIG. 3 shows a perspective view of part of a laminated core 11, with a groove 12 into which a groove insert 3 is inserted. There are also electrical conductors 2 in the groove
- the groove insert 3 is fastened to the laminated core 11 by a locking lug 33.
- 4 shows a plan view of part of a laminated core 11 with a groove 12.
- a groove insert 3 is inserted into the groove 12, as already described above.
- the closed surface 32 formed on the groove insert 3 is also shown.
- FIG. 5 shows a perspective view of a stator 1 according to the invention with a laminated core 11. Winding heads 23 of the electrical conductors are shown.
- caps 5 are provided which, in the assembled state of the arrangement shown, define an area for coolant 100 around the winding heads 23. Sealing rings 51 are provided here for sealing between the area for coolant 100 and the laminated core 11 of the stator 1.
- the caps 5 have an inlet or outlet 52 for coolant 100.
- FIG. 6 shows a section through part of a stator 1. It shows winding heads 23, caps 5 and regions 53 for coolant 100 around the winding heads 23, which are defined by the caps 5.
- FIG. 7 shows a further embodiment of a stator 1 according to the invention with a laminated core 11.
- the spacer is provided by two fixing disks 4 at the axial ends of the stator 1.
- the fixing disk 4 has locking knobs 41 for fixing the electrical conductor 2 in order to ensure the defined distances 22 in the grooves 12.
- the fixing disk 4 also has a closed contour 42 on the radially inner circumference of the stator 1, which favors the sealing of the laminated core 11 and the tight connection with caps 5.
- FIG. 8 shows a detail from one of the fixing disks 4 used in the embodiment shown in FIG. 7.
- the locking knobs 41 and the closed contour 42 can be seen.
- FIG. 9 shows a top view of a groove 12 with an overlying fixing disk 4 from which only part is shown. Also shown are the electrical conductors 2 of the windings of the stator 1, which are placed in the groove 12 and fixed by locking knobs 41. Part of the closed contour 42 can also be seen.
- 10 shows an embodiment of an electrical machine 200 according to the invention.
- the electrical machine 200 comprises a stator 1 according to the invention, a rotor 300, a housing 400 and a shaft 301 of the rotor 300.
- a moment support 13 is provided made of electrically insulating material, which mechanically connects the stator 1 to the housing 400, in the embodiment shown, without restricting the invention thereto, by a screw connection 14.
- This achieves mechanical fixation of the stator 1 with respect to the housing 400 without creating an electrically conductive connection between the stator 1 and housing 400 is given. Therefore, a required basic insulation is achieved without having to use Isolationsma material in the slots 12 of the stator 1. By dispensing with the insulation material in the grooves 12, the heat transfer from the electrical conductor 2 to the coolant 100 is improved.
- the shaft 301 which carries the rotor 300, has a flange 70 made of electrically insulating material at both ends.
- Each flange 70 is mechanically connected to a flange 81, for example, and without restricting the invention thereto, via a screw connection 71.
- Each flange 81 in turn is connected to a bearing shaft 82.
- Each bearing shaft 82 is received in a bearing 80 which is provided in the housing 400.
- FIG. 10 shows a sectional view through the electrical machine 200, in which only part of the electrical machine 200 is shown on one side of the axis of rotation 500.
- the axis of rotation 500 also defines the axial direction for the stator 1 in the context of this application.
- FIG. 11 shows a further embodiment of an electrical machine 200 according to the invention.
- the elements shown have largely already been explained in the context of FIG.
- the difference between the embodiment shown here and the embodiment shown in FIG. 10 consists in the design of the torque support 13 electrically insulating material.
- the torque support 13 is attached to the front side on a projection 410 of the housing 400.
- mechanical fixation of the stator 1 with respect to the housing 400 is achieved without there being an electrically conductive connection between the stator 1 and the housing 400.
- the torque support 13 is here connected to the stator 1 and projection 410 by screw connections 14, without the invention being restricted thereto.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Cooling System (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019122469.1A DE102019122469A1 (de) | 2019-08-21 | 2019-08-21 | Statorkühlung |
| PCT/DE2020/100638 WO2021032238A1 (de) | 2019-08-21 | 2020-07-21 | Statorkühlung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4018534A1 true EP4018534A1 (de) | 2022-06-29 |
| EP4018534B1 EP4018534B1 (de) | 2026-03-18 |
Family
ID=71994269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20753282.1A Active EP4018534B1 (de) | 2019-08-21 | 2020-07-21 | Statorkühlung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4018534B1 (de) |
| DE (1) | DE102019122469A1 (de) |
| WO (1) | WO2021032238A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021109007B4 (de) | 2021-04-12 | 2023-04-13 | Schaeffler Technologies AG & Co. KG | Direkter Nutkühlung in elektrischen Maschinen |
| DE102021119594B4 (de) | 2021-07-28 | 2023-03-30 | Schaeffler Technologies AG & Co. KG | Temperierungssystem |
| JP7805743B2 (ja) * | 2021-10-12 | 2026-01-26 | 株式会社日立産機システム | 回転電機および産業機械 |
| EP4380012B1 (de) | 2022-11-29 | 2026-01-28 | Hamilton Sundstrand Corporation | Statoranordnung |
| DE102023202321A1 (de) | 2023-03-15 | 2024-09-19 | Zf Friedrichshafen Ag | Nutisolierauskleidung für Elektromotoren und Herstellungsmethode |
| DE102023106903A1 (de) * | 2023-03-20 | 2024-09-26 | Schaeffler Technologies AG & Co. KG | Stator, Verfahren zur Herstellung des Stators und elektrische Rotationsmaschine |
| DE102023109008A1 (de) | 2023-04-11 | 2024-10-17 | Schaeffler Technologies AG & Co. KG | Stator, elektrische Rotationsmaschine und Kraftfahrzeug |
| EP4614772A1 (de) * | 2024-03-06 | 2025-09-10 | Garrett Transportation I Inc. | E-maschine mit dichtungsträgeranordnung für direkt gekühlte wicklungen |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1017265B (de) * | 1954-12-24 | 1957-10-10 | Licentia Gmbh | Leiteranordnung fuer stark gekuehlte elektrische Maschinen, insbesondere Turbogeneratoren |
| FR2556146B1 (fr) * | 1983-12-05 | 1988-01-15 | Paris & Du Rhone | Dispositif de montage et d'isolation de conducteurs sur les rotors de machines tournantes electriques |
| US5081382A (en) * | 1990-10-01 | 1992-01-14 | Sundstrand Corporation | Generator end turn cooling using oil flow control tubes |
| US20060119196A1 (en) * | 2004-12-06 | 2006-06-08 | Nissan Motor Co., Ltd. | Supporting structure for cooling jacket of motor/generator |
| EP3223394A1 (de) * | 2016-03-22 | 2017-09-27 | Siemens Aktiengesellschaft | Fluidgekühltes aktivteil, elektrische maschine und antriebssystem |
| DE102017119033B4 (de) | 2017-08-21 | 2020-03-19 | Dynamic E Flow Gmbh | Wicklungsstück und elektrische Maschine mit einem solchen Wicklungsstück |
| DE102017220123A1 (de) * | 2017-11-13 | 2019-05-16 | Audi Ag | Nutwandisolation für einen Stator eines Elektromotors |
| DE102018116031A1 (de) * | 2018-07-03 | 2020-01-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Elektromotor mit zu Statornuten beabstandeten elektrischen Leitern |
-
2019
- 2019-08-21 DE DE102019122469.1A patent/DE102019122469A1/de active Pending
-
2020
- 2020-07-21 WO PCT/DE2020/100638 patent/WO2021032238A1/de not_active Ceased
- 2020-07-21 EP EP20753282.1A patent/EP4018534B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021032238A1 (de) | 2021-02-25 |
| EP4018534B1 (de) | 2026-03-18 |
| DE102019122469A1 (de) | 2021-02-25 |
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